public function IsbnValidator::validate

Checks if the passed value is valid.

@api

Parameters

mixed $value The value that should be validated:

Constraint $constraint The constraint for the validation:

Overrides ConstraintValidatorInterface::validate

File

drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Constraints/IsbnValidator.php, line 30

Class

IsbnValidator

Validates whether the value is a valid ISBN-10 or ISBN-13.

Namespace

Code

public function validate($value, Constraint $constraint) {
  if (null === $value || '' === $value) {
    return;
  }
  if (!is_scalar($value) && !(is_object($value) && method_exists($value, '__toString'))) {
    throw new UnexpectedTypeException($value, 'string');
  }
  if (!is_numeric($value)) {
    $value = str_replace('-', '', $value);
  }
  $validation = 0;
  $value = strtoupper($value);
  $valueLength = strlen($value);
  if (10 === $valueLength && null !== $constraint->isbn10) {
    for ($i = 0; $i < 10; $i++) {
      if ($value[$i] == 'X') {
        $validation += 10 * intval(10 - $i);
      }
      else {
        $validation += intval($value[$i]) * intval(10 - $i);
      }
    }
    if ($validation % 11 != 0) {
      if (null !== $constraint->isbn13) {
        $this->context
          ->addViolation($constraint->bothIsbnMessage);
      }
      else {
        $this->context
          ->addViolation($constraint->isbn10Message);
      }
    }
  }
  elseif (13 === $valueLength && null !== $constraint->isbn13) {
    for ($i = 0; $i < 13; $i += 2) {
      $validation += intval($value[$i]);
    }
    for ($i = 1; $i < 12; $i += 2) {
      $validation += intval($value[$i]) * 3;
    }
    if ($validation % 10 != 0) {
      if (null !== $constraint->isbn10) {
        $this->context
          ->addViolation($constraint->bothIsbnMessage);
      }
      else {
        $this->context
          ->addViolation($constraint->isbn13Message);
      }
    }
  }
  else {
    if (null !== $constraint->isbn10 && null !== $constraint->isbn13) {
      $this->context
        ->addViolation($constraint->bothIsbnMessage);
    }
    elseif (null !== $constraint->isbn10) {
      $this->context
        ->addViolation($constraint->isbn10Message);
    }
    else {
      $this->context
        ->addViolation($constraint->isbn13Message);
    }
  }
}